NetFind Web Search

Search results

  1. Results From The WOW.Com Content Network
  2. Dirac equation - Wikipedia

    en.wikipedia.org/wiki/Dirac_equation

    Quantum mechanics. In particle physics, the Dirac equation is a relativistic wave equation derived by British physicist Paul Dirac in 1928. In its free form, or including electromagnetic interactions, it describes all spin-1/2 massive particles, called "Dirac particles", such as electrons and quarks for which parity is a symmetry. It is ...

  3. Negative energy - Wikipedia

    en.wikipedia.org/wiki/Negative_energy

    According to the theory of the Dirac sea, developed by Paul Dirac in 1930, the vacuum of space is full of negative energy. This theory was developed to explain the anomaly of negative-energy quantum states predicted by the Dirac equation. A year later, after work by Weyl, the negative energy concept was abandoned and replaced by a theory of ...

  4. Dirac sea - Wikipedia

    en.wikipedia.org/wiki/Dirac_sea

    The Dirac sea is a theoretical model of the electron vacuum as an infinite sea of electrons with negative energy, now called positrons. It was first postulated by the British physicist Paul Dirac in 1930 [1] to explain the anomalous negative-energy quantum states predicted by the relativistically-correct Dirac equation for electrons. [2]

  5. Positron - Wikipedia

    en.wikipedia.org/wiki/Positron

    The positron or antielectron is the particle with an electric charge of +1 e, a spin of 1/2 (the same as the electron), and the same mass as an electron. It is the antiparticle ( antimatter counterpart) of the electron. When a positron collides with an electron, annihilation occurs. If this collision occurs at low energies, it results in the ...

  6. Fermi level - Wikipedia

    en.wikipedia.org/wiki/Fermi_level

    Fermi-Dirac distribution () vs. energy , with μ = 0.55 eV and for various temperatures in the range 50 K ≤ T ≤ 375 K. In the band theory of solids, electrons occupy a series of bands composed of single-particle energy eigenstates each labelled by ϵ. Although this single particle picture is an approximation, it greatly simplifies the ...

  7. Relativistic quantum mechanics - Wikipedia

    en.wikipedia.org/wiki/Relativistic_quantum_mechanics

    The Dirac equation still predicts negative energy solutions, [6] [24] so Dirac postulated that negative energy states are always occupied, because according to the Pauli principle, electronic transitions from positive to negative energy levels in atoms would be forbidden. See Dirac sea for details.

  8. Quantum field theory - Wikipedia

    en.wikipedia.org/wiki/Quantum_field_theory

    It was realized in 1929 by Dirac and others that negative energy states implied by the Dirac equation could be removed by assuming the existence of particles with the same mass as electrons but opposite electric charge. This not only ensured the stability of atoms, but it was also the first proposal of the existence of antimatter.

  9. Antiparticle - Wikipedia

    en.wikipedia.org/wiki/Antiparticle

    In particle physics, every type of particle of "ordinary" matter (as opposed to antimatter) is associated with an antiparticle with the same mass but with opposite physical charges (such as electric charge ). For example, the antiparticle of the electron is the positron (also known as an antielectron). While the electron has a negative electric ...